[Amps] Resting plate watts with An 8877

[Gary Schafer]

If you think that the base of the 8877 doesn't get hot from the filament
just leave the filament on for a few minutes with no air. Then pull the tube
out of the socket and grab the base. Have some burn cream handy!

73
Gary  K4FMX

> Why would the filament heat be concentrated at the socket pins? If that
> were the case, then the filament itself wouldn't be getting hot, which
> would mean that there would be no electron emission and the tube
> wouldn't
> work.
> 
> If you're thinking that the socket pins will get hot from ohmic heating,
> then you're postulating high-resistance connections between the pins and
> the socket contacts, which would be A Very Bad Thing.
> 
> I think that the filament is going to heat the grid and plate the most,
> by
> radiation, because it's closest to them, while there will be less
> heating
> by conduction down the filament connections to the tube base and through
> it
> to other parts of the tube.
> 
> --
> Mike Andrews, W5EGO
> mikea at mikea.ath.cx
> Tired old sysadmin
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